Part 2
To be more specific, Goku and Chi-Chi love their sons and have potential to be good parents.
Chi-Chi's biggest issue is her abusive behavior. Hitting her husband and sons with a frying pan is awful and inexcusable. Writing that out of her character, she's just an exaggeration of a stereotypical traditional Asian wife and mother. She wants Gohan to study to have more opportunities, even though she goes overboard. It was odd and hypocritical that she trained Goten instead of Gohan, but it's good that she knows that they are different people. Also, she does have a point that Goku's friends are delinquents because they are former criminals, perverts, rebellious, and incredibly flawed. However, it's also interesting considering that her father is also a delinquent and a tyrant since he clearly won his kingdom through conquest and ruled over other people with fear before softening. Also, Chi-Chi was clearly very rebellious.
Goku is definitely a free spirit and instinctive individual. He is a friendly-alien who trains, love to fight and is great at it, always gets stronger, eats a lot, easily makes friends, looks for the best in people, and has a simple outlook at the world (and other worlds). However, I don't think he's as dumb as he seems when done right. First of all, Goku hit his head as a baby so hard that it literally knocked the bad right out of him and gave him amnesia. It's not out of the question that it affected him in other ways. It makes sense that his mental development was affected by a head injury that nearly killed him. Second, he grew up in the mountains alone for several years after only living with his grandfather. Therefore Goku is understandably outside of normal society and not influenced by what is excepted as normal, for better or worst. Lastly, no one ever really explains anything to Goku. Generally, everyone either just lets him do his thing or yells at him, but no one ever really talks to him about much. It's good that they accept him as he is, but it's weird to put expectations on someone without trying to have a conversation with them, especially for someone like Goku who has not had the same life experiences that most people take for granted, and there are plenty of people around him who could at least try to explain things to Goku.
As a couple, Goku and Chi-Chi can really balance each other out because Chi-Chi gives Goku structure and stability, while Goku is good at calming Chi-Chi down when she overreacts, even if she just passes out.
I also don't get how Bulma and Vegeta are model parents compared to Goku and Chi-Chi (they're all around the same level). Even if you compare Goku being absent to Vegeta being present, they are both doing the exact same thing: training. It's like comparing someone spending hours in an arcade to someone playing X-box in their basement.